89 f150 idle issue
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2nd Gear
Joined: Apr 2025
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89 f150 idle issue
I have an 89 f150 with a 302 EFI, it idles at I would assume 1800-2000 on cold start then idles down after about 5-6 seconds to about 1200 then down to I would say a normal idle rpm. If I turn the truck off and turn it back on after the engine is warmed up it will idle to normal idle then drop to like 2-300 rpm’s and sometimes stall and it might jump up and down 2 or 3 times before settling to a normal idle. I just want some ideas before I go meddling things basically.
Cargo Master
Joined: Aug 2021
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From: Maryland
How to clean and test the Idle Air Control valve https://www.fullsizebronco.com/threa...ur-iac.206960/
More Turbo
Joined: Oct 2023
Posts: 607
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From: Canada
no. I used knowledge that says replace your 7 dollar temperature sender. Its a maintenance part. Did you lose everything in the divorce?
Hotshot
Joined: Jun 2015
Posts: 12,832
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I used experience that says the new part might be worse than your old part. Verify before throwing your wallet at the problem. Not divorced but it seems you did.
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More Turbo
Joined: Oct 2023
Posts: 607
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From: Canada
Temperature senders are literally maintenance items. If you don't have the 7 bucks and you don't know why it's a maintenance item you are not qualified to give advice. And if you cant afford to change a Temperature sender as a maintenance item you can't afford to drive. If you think replacing maintenance items isn't worth the time go grab the book, find the resistance value and test it. But since the parts 7 bucks. Just change it. If you experience fefes over someone smarter giving better advice. Change. Fundamentally as a person.
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Hotshot
Joined: Jun 2015
Posts: 12,832
Likes: 2,436
Nonsense. If it is a maintenance item then how often are you supposed to change it? What about the air temp sensor and the oil pressure sending unit? That must mean that they are also supposed to changed out at regular intervals. Sorry if I got your panties in a bunch for suggesting actual diagnostic testing before throwing parts at the problem.
More Turbo
Joined: Oct 2023
Posts: 607
Likes: 153
From: Canada
coolant temp sensor when the rad goes. Air temp sensor upon failure and oil pressure sender when you change the pan. Coolant temeperature senders are cheap. Give the computer one ifs most important inputs. And are made of brass. They also don't fail fully. So they can keep working while fouling your exhaust. That's why you change them. Every time you change a radiator. Or whenever you are doing maintenance for a run condition? Why? It's cheap. It's one of the most important inputs for the ECM. It's a dissimilar metal. And lastly it doesn't fail all at once. It degrades in performance. Or go find the CD with the spec. Dust off the rom drive and look up the specs. And get your water boiling. Once you know your truck you will know what parts to buy based on smell. Change your temperature senders people.
Hotshot
Joined: Jun 2015
Posts: 12,832
Likes: 2,436
Huh? 
Change the temp sensor when you replace the radiator so if the radiator never needs to be replaced it is good forever? Same for the air temp sensor - it will last the life of the vehicle? Why would you change the oil pressure sending unit because you changed the oil pan? What does changing the oil pan have to do with the oil pressure sending unit?
Change the temp sensor when you replace the radiator so if the radiator never needs to be replaced it is good forever? Same for the air temp sensor - it will last the life of the vehicle? Why would you change the oil pressure sending unit because you changed the oil pan? What does changing the oil pan have to do with the oil pressure sending unit?
More Turbo
Joined: Oct 2023
Posts: 607
Likes: 153
From: Canada
Huh? Change the temp sensor when you replace the radiator so if the radiator never needs to be replaced it is good forever? Same for the air temp sensor - it will last the life of the vehicle? Why would you change the oil pressure sending unit because you changed the oil pan? What does changing the oil pan have to do with the oil pressure sending unit?
Change the temp sensor when you replace the radiator so if the radiator never needs to be replaced it is good forever? Same for the air temp sensor - it will last the life of the vehicle? Why would you change the oil pressure sending unit because you changed the oil pan? What does changing the oil pan have to do with the oil pressure sending unit?
Hotshot
Joined: Jun 2015
Posts: 12,832
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You change the coolant temperature sensor more than that. I do it anytime I change coolant. I also change radiators out before they fail. But a coolant sensor will last about as long as your radiator. But anytime your nose tells you theres an issue. Change it. Buy it when you buy plugs.Air temperature sensors are easy to get to and expensive. So you let them fail. Oil pressure sensor is cheap. And you're already laying on your back with extra room so you change it. If you can't understand these things there's a reason. And the reason is you.
apparently I touched a nerve when I called you out for using the parts cannon
More Turbo
Joined: Oct 2023
Posts: 607
Likes: 153
From: Canada
No. I'm just answering your questions so you learn why you change your 7 dollar coolant temperature sender. If you fail to replace parts like that. Enjoy your fouled cats.
More Turbo
Joined: Oct 2023
Posts: 607
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From: Canada
Ok so what is prevention? What do we want to avoid? Breakdowns. What is the best way? Preventative maintenance. How should we approach it? Mathematically. These are not my bespoke ideas. I didn't invent the idea of replacing coolant temperature sensors. But I do know exactly how they fail and how much lifespan loss the fleet can expect not changing them. And the fuel burn rate associated. So here. Use A.I. since you cant learn from a person.